Diagnostic question

[DewRonInc]

I do all myself, now do I trust myself, that is another thing, lol

[EuropeanAM]

I can tell you one thing... if you get the engine connected to Diacom and get a full history report (Run History, Freeze Frame (Fault) History, and Fault Seconds Counters) we will be able to view those and tell a heck of a lot more than "guessing".

Worst case... you can even record the engine and send the file to me (I have the ability to play it back if that's needed).

[BassnChris]

I can tell you one thing... if you get the engine connected to Diacom and get a full history report (Run History, Freeze Frame (Fault) History, and Fault Seconds Counters) we will be able to view those and tell a heck of a lot more than "guessing".

Worst case... you can even record the engine and send the file to me (I have the ability to play it back if that's needed).

Thank you Don.
I'm ordering the Diacom soon and will post back with findings.

[BassnChris]

The Diacom website says I must have the 555 PCM.
I have a DFI ECM.
Will the Diacom still work for me?

s-l1600.jpg

EDIT: It looks like this indicates that it will work with my DFI ECM, right?

Screenshot_20220930_065203_Photo Editor.jpg

[JOE54]

should work fine

[BassnChris]

should work fine

Thanks....it'll be here Tuesday!

[BassnChris]

FINALLY!
The kit arrived on Sunday (2 days early) and I was into another job so had to wait. Finally got it hooked up and realized I really had no idea what I was doing.
I'm not sure exactly what is a full history report (Run History, Freeze Frame (Fault) History, and Fault Seconds Counters)
I have some screen shots - hoping y'all can help me decipher them.
My initial impression is the air temp sensor. Let me know what I missed and I will grab them.
Thanks
Chris

Active Code.jpgFaultHX1.jpgFaultHX2.jpg

[Bob G.]

Read faults and History then save the data. The report will look like a regular diagnostic report.

See post #6.

http://www.bbcboards.net/showthread....ghlight=Diacom

[BassnChris]

Read faults and History then save the data. The report will look like a regular diagnostic report.

See post #6.

http://www.bbcboards.net/showthread....ghlight=Diacom

With engine running?

[Bob G.]

With engine running?

You can get the report with engine running or not. I do mine with the motor running on the muffs. If not running the motor, just have to turn the key to “on” so that the software will connect to the PCM.

[BassnChris]

OK that is what I did, with the engine off ignition on. I only had one active fault code - air temp sensor.
I took screen shots instead of savng. Will it give you any additional info about the fault?

I am guessing when you have the engine running you get more information?

Thanks

[BassnChris]

Another boo boo - my computer acting up.

[BassnChris]

Duplicate

[BassnChris]

I will try it again this evening.....It looked like the air temp sensor wires were pinched at one time. There is also electical tape around one of the wires.
Can those wires be spliced?
I ask so that I will know if its right or someone did something wrong there.

Thanks
Chris

[EuropeanAM]

AIR TEMP SENSOR is located on the Intake Manifold (not the one on the air compressor).

[BassnChris]

AIR TEMP SENSOR is located on the Intake Manifold (not the one on the air compressor).

Is this the one on the front of engine?

Screenshot_20221007_165341_Acrobat for Samsung.jpg

[Bob G.]

Is this the one on the front of engine?

Screenshot_20221007_165341_Acrobat for Samsung.jpg

The air temp sensor is mounted on top of the air plenum. Shown in the electrical section in the Mercury manual.

[EuropeanAM]

Is this the one on the front of engine?

Screenshot_20221007_165341_Acrobat for Samsung.jpg

Yes, for the engine in question, it is likely mounted as shown in that image.

[BassnChris]

Yes, for the engine in question, it is likely mounted as shown in that image.

Thank you Don, Joe54, Bob G. and everyone else.
Turns out the one of the connectors for the air temp sensor was not fully connected if at all. It had electrical tape around it so I was expecting the worst. I started to unwrap the tape and almost immediately the wire and connector popped out. I got a sinking feeling and continued to unwrap the tape. Once I had removed the tape, I examined both connectors closely. I could see no damage at all. I reconnected the connectors and they snapped in tightly. I have no idea why they had tape on it. Turned the ignition on and no check engine light! I connected the diacom again and it showed no active faults. WooHoo! $600 to find out something was disconnected. Worth every penny! Now I have it and it will help me going forward.

Thank you again everyone. I really appreciate your help with this.
Chris

DIACOM MARINE SERVICE REPORT


10/07/2022 17:43:53

1. VEHICLE CONFIGURATION

Cust. Name: CHRIS
Engine Make: MERCURY OPTIMAX
Engine Serial No: 0G842489
Model Year: 1999
System Type: Mercury DFI Outboard ECM

2. PERFORMANCE DATA

Parameter Description Value Unit

Engine Speed.......................................... 0 RPM
Port Coolant Temp.................................... 73 °F
Throttle Percent................................... 0.00 %
Starboard Coolant Temp............................... 73 °F
TPS 1 Voltage...................................... 4.66 VDC
Air Temperature Sensor............................... 75 °F
TPS 2 Voltage...................................... 0.47 VDC
Air Compressor Temperature........................... 75 °F
Battery Voltage..................................... N/A VDC
Time To Oil........................................ 0.00
Sensor Power....................................... 4.98 VDC
Oil Inj Count......................................... 0 #
Sensor Power 2..................................... 5.00 VDC
Low Oil Switch...................................... OFF
Manifold Absolute Pressure........................ 14.26 PSI
Water In Fuel Sensor................................ OFF
Block Pressure..................................... 0.29 PSI
Shift Switch......................................... ON
Trigger Errors........................................ 0 #

3. TROUBLE CODE STATUS
Snapshot created on: Fri 10/7/2022 05:38:17 PM

Engine Controller Type: Mercury DFI Outboard ECM

Engine System Information
_________________________

Engine Parameter List
_____________________
Engine Speed = 0 RPM
Port Coolant Temp = 73 F
Throttle Percent = 0.00 %
Starboard Coolant Temp = 73 F
TPS 1 Voltage = 4.66 VDC
Air Temperature Sensor = 75 F
TPS 2 Voltage = 0.47 VDC
Air Compressor Temperature = 75 F
Battery Voltage = N/A VDC
Time To Oil = 0.00
Sensor Power = 4.98 VDC
Oil Inj Count = 0 #
Sensor Power 2 = 5.00 VDC
Low Oil Switch = OFF
Manifold Absolute Pressure = 14.26 PSI
Water In Fuel Sensor = OFF
Block Pressure = 0.29 PSI
Shift Switch = ON
Trigger Errors = 0 #

Engine Trouble Codes
____________________
Fault Code List:

No Fault Codes Found

Current ECM Codes

Fault History:

Ignition 1 = 0
Ignition 2 = 0
Ignition 3 = 0
Ignition 4 = 0
Ignition 5 = 0
Ignition 6 = 0
Injector 1 = 0
Injector 2 = 0
Injector 3 = 0
Injector 4 = 0
Injector 5 = 0
Injector 6 = 0
Oil Pump = 0
Starboard ECT Sensor = 0
Port ECT Sensor = 0
Air Compressor Temp = 0
Map Sensor = 0
TP Sensor 1 = 8
TP Sensor 2 = 8
Air Temp Sensor = 31
Trigger signal = 0
Block PSI Sensor = 0
Water in Fuel = 0
Low Oil = 0
Battery Voltage = 0
Sensor Power 1 = 0
Sensor Power 2 = 0
Power Relay = 2
Warning Lamp = 0
Warning Horn = 0

Run History:

ECM Run Time (hrs) = 195.6
0 - 999 (hrs) = 8.2
1000 - 1499 (hrs) = 0.2
1500 - 2999 (hrs) = 0.2
3000 - 3999 (hrs) = 1.3
4000 - 4999 (hrs) = 1.1
5000 - 5999 (hrs) = 0.0
6000 - 6999 (hrs) = 0.0
RPM Limit Count = 2
RPM Limit Time (Min) = 0
Power Limit Time (Min) = 1
Break-In Minutes = 240
Over Temp (Min) = 0
Air Comp Temp (Min) = 0
Block PSI Sensor (Min) = 0
Port ECT Sensor (Min) = 0
Starboard ECT Sensor (Min) = 0
Oil Pump (Min) = 0

[Bob G.]